If someone says the following:
"My clothes buying issue is that i don't buy the clothes. I pay for them but the rest of the buying process (socks incl. if they are and issue;) is what girls are for."
Would the "is" in "is what girls are for" actually be is or should you use are? Or could both be used?
The subject for the verb "is" in that clause is "the rest of the buying process." That would take the singular verb, so "is" is correct.
[a writer, not a teacher]